I don't think anyone is saying one factor is more important than another. Turnovers, more than anything else, cost us one game (Indy) while redzone ineffeciency cost us another (Tennessee). Neither was a factor in the Jacksonville game. Against Pittsburgh, everything went wrong.
Nobody said redzone efficiency is an exact predicter of record, but when the top 5 redzone teams are 14-11 (and that includes Detroit's 0-5 record due to its inept offense) while the bottom five are 10-17, it does say something.
But I will argue with you that turnovers are the biggest reason we sit at 1-4. As I've already stated, turnovers killed us against Indy, no doubt about it, But, on the other side, turnovers played absolutely no role in the Jacksonville loss (we had none) while we beat Miami despite being -3 in takeaways.
So that leaves Tennessee and Pittsburgh. Pittsburgh is easy: turnovers were only part of the story; the whole team was overwhelmed. The offense was inept even when they weren't giving the ball away and, except for the two plays where Mario sacked Roethliswhatever, our D just could not stop them until the score was 35-3
As for Tennessee, we committed three turnovers on fourth down within the Titan redzone (two stops and one interception of a "what the hell" pass Schaub tossed up as VandenBosch was pulling him down). So, while those are turnovers, they have more to do with our failure to move the ball inside the redzone. We had two other turnovers: an interception on our 33 in the first quarter and a 4th-and-10 interception from the Titan 48. Neither led to points or really cost us points (I think we used up all our 4th-and-10 luck last Sunday). All in all, we had the ball in the Titan redzone on 6 times. Had we hit our own mediocre average for the year (50% TDs, 67% FGs), we're looking at 27 points. That would have, most likely, won that game for us.
So, on the whole, turnovers only cost us the Indy game--and I think we all agree that the turnovers in question that game were more the product of bad voodoo than anything else (even the most ardent StartSager probably hopes to never see the Rosencopter take flight again).